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(No Model.)

E. I. NICHOLS.

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Patented Apr. 3, 1888.

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Iva/0371 30? UNITED STATES PATENT rrrc.

EMORY I. NICHOLS, OF SAN FRANCISCO, CALIFORNIA.

VISE.

SPECIFICATION forming part of Letters Patent No. 380,401, dated April 3, 1888.

Application tiled December 14. 1887. Serial No. 257,903. (No model.)

To aZZ whom it may concern.-

Be it known that I, EMORY I. NIoHoLs, a citizen of the United States, and a resident of the city and county of San Francisco and State of California, have invented certain new and useful Improvements in ViseEqualizers, of which the following is a specification.

My invention relatestoimprovements in that class of viseequalizers in which a toothed sector or gear-wheel works in a rack guided by suitable guides held in position by springs, and the center of toothed sector or gear-wheel connected to the movable jaw of vise by bars or a triangle.

My improvements are embodied in the mechanism illustrated in the accompanying drawings, in which Figure l is a side elevation showing the construction of my improvements in conjunction with the bench-jaw and screw. Fig. 2 is a view of sectorsprings and end section of rack.

The same letters refer to the same or corresponding parts throughout the two views.

A is a toothed sector working in the rack 13, and is held to its engagement with the rack by the tension-springs G O. The ends of Springs are secured to the sides of sector A and rack B by the studs D and D The lower end of sector A at h is slotted for the reception of bars or triangle E E. One end of each bar is pivotally connected to sector at h. The other ends of bars pass through a slot in the stationary jaw H, and are secured to the movable jaw I, one end at d, or near the screw, and the other end at d, or near the bottom of movable jaw. The rack B is made with sides or guides, and is secured to the under side of bench-top or to a cross-bar, k. It will thus be seen that by the movement of the screw F, Fig. 1, the center or lower end of sector at h-will be moved in a horizontal line, which is attained by the sector rolling on its rim, thereby keeping the center h always the same distance from the bar It. Then the bar E, being connected to the center of sector at hand the movable jaw at d, or near the screw F, the center 71 will move the same distance as the movable jaw at d. Then the bar E being connected to the cen ter of sector at h and the lower end of the movable jaw at d, the movable jaw at (1" will move the same as at (1, thereby keeping the movable jaw always parallel with the stationary jaw H.

I do not confine my improvements to one sector. There may be one or more sectors or full circles of a greater or less radius with or without the rack B.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a vise, the toothed sector A, slotted at h for the reception of bars E E having the studs D 1) to engage the springsO G", the rack B, with sides and studs D D to engage springs C G and secured to cross-bar k, the springs C O, by which the sector A is held to its engagement with rack B, and the bars or triangle E E pivotally connected to sector A, and secured to movable jaw of vise, substantially as and for the purpose described.

2. The combination, with the movable jaw I of a vise, of the stationary jaw H, the screw F, the toothed sector A, the rack B, the springs O 0 and the bars or triangle E E substantially as and for the purpose described.

In witness whereof I have hereunto set my hand.

EMORY I. NICHOLS.

'Wi tnesses Gno. L. Frron, SAMUEL Hoorrrne. 

